Drop shutter system applicable to photoelectric warp frame thread stops



July 13, 1954 l. SAGNIER VlDAL 2,683,300

DROP SHUTTER SYSTEM APPLICABLE TO PHOTOELECTRIC WARP FRAME THREAD STOPS Filed Sept. 6. 1951 I ,A /P I INVENTOR. f- /7/7 ac/a Say/vex- Mc/a/ BY 0 Q Patented July 13, 1954 UNITED sTAras OFFICE DROP SHUTTER SYSTEM APPLICABLE TO PHOTOELECTRIC WARP FRAME THREAD STOPS 1 Claim. 1

The present invention relates to a drop shutter system, applicable to photo-electric warp frame thread stops, and the mounting thereof on the thread to be controlled.

The invention is applicable to those photoelectric systems in which the obturation of the beam of light is effected by the fall of a screen.

The system which will be now described comprises a screen the principal feature of which consists in its being arranged in a suitable way such as to ride upon a thread, being maintained in an upright position by the tension of said thread.

To make the explanation more explicit, reference will now be made to the accompanying sheet of drawings showing one embodiment merely by way of example.

In the drawing:

Fig. 1 shows in front view the arrangement of the system which is described with the screens in their lower position;

Fig. 2 shows in sectional view the arrangement of the system as shown in Fig. l, and

Fig. 3 is a view similar to Fig. 2 with the screen in working position.

In the embodiment shown, the drop shutter system comprises a screen or thin plate I, formed of opaque material, such as, sheet metal or the like. A wire, bent into the shape of a fork, constitutes a support 2 for the screen. The free 6 ends of the support are fixed to the screen or plate I by any suitable means. ends may be welded to one of the plate faces as shown, or to the upper edge of the plate so that the remainder of the support extends upwardly from the upper edge of the plate or screen.

The assembly described is disposed in a mounting device defined by and including two vertically spaced, horizontally extending rods 3 and 3 so that the lateral portions of the support are'each placed at a respective side of the rods with the screen or plate hanging underneath. The rod 3 defines a vertical stop which determines the lower position of the assembly when the bight portion of the fork 2 contacts the rod 3. The rod 4 serves to limit the upper position of the assembly when the upper edge of the screen or plate engages the rod 5 due to some abnormal jump produced by a blow of the thread.

The mounting device also includes two guide rods 5 and 6 disposed horizontally and it can be seen that each rod engages one of the end faces or edges of the plate or screen I to restrict the lateral displacement of the screen.

It is to be understood that several assemblies For instance, the

are arranged in the mounting device depicted in Fig. 1 so that contiguous screens or plates I will maintain each other in place in a longitudinal direction. The entire system is placed under threads I to be controlled with each support riding on each thread as shown in Fig. 3. This retains the screens I over a light beam 8 leading from a light source to a photoelectric cell adapted to control the operation of the machine to which the system is applied, the machine parts not being illustrated.

If a thread breaks, or the tension thereof falls to a predetermined value, the screen or plate I will then assume the position shown by the dotdash lines 9 of Fig. 3, thus intercepting the light beam and thus effecting the stop.

This invention within the extent of its scope may be carried out in other forms of embodiment which may difier in detail from that indicated by way of example, to which will extend also the claimed protection, that is to say that the same may be designed in any shape and size and that in the manufacture of the same may be employed thematerials most suitable to each case, all that being comprehended within the spirit of the claim.

Having now described and ascertained the nature of my invention and in what manner the same is to be performed, I declare that what I claim as new and desire to secure by Letters Patent,is:

In a drop shutter system for use with photoelectric warp frame thread stops and the mounting therefor on the thread to be controlled, comprising in combination, an obturating screen defined by opaque material, a narrow fork-shaped support secured at the free ends thereof to the said screen with the remainder of the support extending upwardly from the screen, a pair of vertically spaced guide rods located within the space between the legs or the fork-shaped support and defining upper and lower movement limits for the screen, the closed end of the said fork-shaped support being adapted to ride on the thread to be controlled thereby, a pair of horizontally spaced guide rods, each of the said horizontally-spaced guide rods being disposed at each end of the screen to limit the screen movement to a vertical direction and a light beam for thephotoelectric system beneath the said screen whereby breakage of the thread allows the narrow fork-shaped support to drop until the closed end thereof contacts the uppermost vertically extending guide rod so that the screen intercepts the light beam, the lowermost vertically extend- 3 ing guide rod serving to arrest the upward move- Number ment of the screen when the screen engages such 937,136 guide rod. 1,857,837 1,873,467 References Cited in the file of thls patent 5 2,233,433 UNITED STATES PATENTS 2,389,625

Number Name Date 759,309 Reinhardt May 19, 1964 Number 806,725 Wyman D66. 5, 1905'- 10 9 2 218 Name Date Wyman Oct. 19, 1909 Blackman May 10, 1932 Payne Aug. 23, 1932 Metcalf Mar. 4, 1941 Lambach Nov. 27, 1945 FOREIGN PATENTS Country Date France Jan. 24, 1951 

